{"id":84523,"date":"2018-03-10T00:08:51","date_gmt":"2018-03-10T00:08:51","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/lep-energy-determination-from-zgamma-events\/"},"modified":"2018-03-10T00:08:51","modified_gmt":"2018-03-10T00:08:51","slug":"lep-energy-determination-from-zgamma-events","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/lep-energy-determination-from-zgamma-events\/","title":{"rendered":"Lep energy determination from zgamma events."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Eugeni Grauges Pous <\/strong><\/h2>\n<p>Uno de los principales objectivos de lep2 es la medida directa de la masa del bos\u00f3n w con un error inferior a 30 mev. Esto requiere una muy precisa determinaci\u00f3n de la energ\u00eda en el centro de masas de lep, con tal de minimizar su contribuci\u00f3n en la incertidumbre de la massa del w. En lep1 esta precisi\u00f3n fue conseguida usando el metodo de depolarizaci\u00f3n resonante para medir la energia. En lep2 esto ya no es posible pues no se ha coseguido hazes polarizados a energies por encima de 65 gev. Entonces, la precisa calibraci\u00f3n por depolarizaci\u00f3n resonante se realiza en el rango de energ\u00edas entre 40 y 65 gev, y despues es necesaria una extrapolaci\u00f3n a alatas energ\u00edas. La precisi\u00f3n conseguida para energias en el centro de masas de 183 gev y 189 gev fue respectivamente alrededor de +-50 mev y +-40 mev. Para los pr\u00f3ximos periodos de adquisici\u00f3n de datos, se espera mejorar esta precisi\u00f3n usando un recientemente instalado spectrometro magnetico.  un metodo alternativo, considerado en esta publicaci\u00f3n, est\u00e1 basado en el analisis de los sucesos e+e- &#8212;-&gt; y f f, donde los fotones de radiaci\u00f3n de estado inicial son mayoritariamente colineares respecto la tuberia de los hazes y permanecen indetectados. Para estos sucesos, la masa invariante, s\u00c2\u00bf, del sistema f f del estado final resuena de manera natural en la masa del bos\u00f3n z. La variable x=1-s\u00c2\u00bf\/s se reconstrueye a partir de los angulos de las part\u00edculas del estado final. Dado que la masa y la anchura de desintegraci\u00f3n de la z son quantidades muy bien determinadas desde el final de lep1, se puede realizar un ajuste a partir de la distribuci\u00f3n de x para determinar la energia en el centro de masas    s.  esta tesis presenta un aplicaci\u00f3n de este metodo, usando el estado final qq, a partir de los datos recogidos en el experimento aleph en 1997 y 1998. lep funcion\u00f3 a energ\u00edas nominales en el centro de masas de 181,182,183 i 184 gev durante 1997, y de 189 gev durante 1998, registr<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Lep energy determination from zgamma events.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Lep energy determination from zgamma events. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Eugeni Grauges Pous <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 15\/05\/2000<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Alain Blondel<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: enrique Fernandez sanchez <\/li>\n<li>ramon Miquel pascual (vocal)<\/li>\n<li>dieter Schlatter (vocal)<\/li>\n<li>Antonio Pich zardoya (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Eugeni Grauges Pous Uno de los principales objectivos de lep2 es la medida directa de la masa [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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